The object orbiting the brown dwarf 2M1207 has a planetary mass, so it could be called as the first imaged extrasolar planet. However, there is no doubt that it formed like a brown dwarf, not like a planet.
There are five other bodies with masses potentially within planetary range. You can see them listed
here.
Fomalhaut b is clearly the most convincing case for a true planet that has formed from a protoplanetary disk. Given the masses and distances of these new planets, it is likely that they formed from disk instabilities instead of core accretion like the planets in our Solar System.